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contrib/pgcrypto mishandled the case where deflate() does not consume all of the offered input on the first try. It reset the next_in pointer to the start of the input instead of leaving it alone, causing the wrong data to be fed to the next deflate() call. This has been broken since pgcrypto was committed. The reason for the lack of complaints seems to be that it's fairly hard to get stock zlib to not consume all the input, so long as the output buffer is big enough (which it normally would be in pgcrypto's usage; AFAICT the input is always going to be packetized into packets no larger than ZIP_OUT_BUF). However, IBM's zlibNX implementation for AIX evidently will do it in some cases. I did not add a test case for this, because I couldn't find one that would fail with stock zlib. When we put back the test case for bug #16476, that will cover the zlibNX situation well enough. While here, write deflate()'s second argument as Z_NO_FLUSH per its API spec, instead of hard-wiring the value zero. Per buildfarm results and subsequent investigation. Discussion: https://postgr.es/m/16476-692ef7b84e5fb893@postgresql.org
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.